用 Arduino 实现最简单的拨动开关

用 Arduino 和轻触开关实现最简单的“拨动开关”（可以保持和切换开关状态），为了便于理解，没有多余的元件，这里只实现一个最简单的开关来控制LED。
效果如上图。下面是接线图和源代码。

/*********************
Simple toggle switch
Created by: P.Agiakatsikas
*********************/

int button = 8;
int led = 13 
int status = false;

void setup(){ 
pinMode(led, OUTPUT); 
pinMode(button, INPUT_PULLUP); // set the internal pull up resistor, unpressed button is HIGH 
}

void loop(){ 
//a) if the button is not pressed the false status is reversed by !status and the LED turns on 
//b) if the button is pressed the true status is reveresed by !status and the LED turns off 

if (digitalRead(button) == true) { 
status = !status; 
digitalWrite(led, status); 
} while(digitalRead(button) == true); 
delay(50); // keeps a small delay 
}